Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac255d08fde5628…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 01:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a496687eac8e4822b26a3caef092ced4 SHA-1: 3a282d3ea7e2add9823c5154b8a9c345a93fc374 SHA-256: 8ac255d08fde5628c0fe4f1a97f3497898e6e96bd8a71aa7b556b072fcb5f257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other domains, acting as a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=android+tv+plex+server PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b3a9bbeef---11635400714.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce2e2c1ec---derewumosodenurate.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3000321---lavotidukuridira.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/wezuxif.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/44687086676.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/15972932860.pdfIn PDF document text
    • https://j26clean.com/upload/files/ronizefowumesom.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/66758740332.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/surosufixapux.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wisujidex.pdfIn PDF document text
    • http://rideco.hu/upload/file/vafavasajenofopizadusi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf30dec52---60151210520.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/legabopawanovil.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/lerilugiranitokifed.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/logez.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/dukenef.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/sirelexudanoz.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/94651581467.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/rerebabeselozigibadolej.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907194709922.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xituwuzokalititavirug.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147ede127e0d---72299104385.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nirepepalalaxe.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/badevuzaloxakivurute.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/71116033138.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/82507207535.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ec4018b3---46177293275.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 18080 bytes
SHA-256: 0a4b80a59a1a195ea9f9bf3209f86837c961430a5b63b4c6430a80999f52639e
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10372 bytes
SHA-256: 9603f19849448e2827f8a52bb7c069304fb84f689dd9568775a242b293288695
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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